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Germ Layers and Organ Formation


14 days

From The Biology of Prenatal Development.Buy Now

Script: 直到出生。

到2 1/2週左右, 外胚層已經形成 3個專門的組織, 或者微生物層, 分別叫做外胚層、 內胚層、 和中胚層。

外胚層產生 許多結構, 包括頭腦、 脊髓、 神經、 皮膚、 指甲 和毛髮。

內胚層產生呼吸系統 和消化道, 並且產生部分主要器官, 比如肝臟 和胰腺。

中胚層形成心臟、 腎臟、 骨骼、 軟骨、 肌肉、 血細胞 和其它結構。

All ages referenced to fertilization, not last menstrual period.
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